Is it possible to make get variable out of filter in Class?

The filter has 2 args, not one.

Try:

add_filter ( 'woocommerce_account_menu_items', array($this, 'wooquickmy_grab_endpoints'), 10 , 2 );

public function wooquickmy_grab_endpoints($items, $endpoints){
        // do something with $endpoints
        return $items;
    }

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)